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          <h1 class="post-title" itemprop="name headline">button实现文件下载

              
            
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        <p><center>在点击按钮之后，给后台发出下载文件的请求。</center><br><a id="more"></a></p>
<h2>一、需求<br></h2>

<p>&nbsp;&nbsp;&nbsp;&nbsp;页面有个 table，是综合统计计算而来的产物，现在想把它已 excel 的方式导出来，excel 有样式要求，为了图省事，导出的操作就放在后台逻辑来处理。<br></p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;数据查询复杂，所以就直接将数据传递给后台，然后由后台封装再下载。<br></p>
<p><br></p><p></p>
<h2>二、实现</h2>

<p>&nbsp;&nbsp;&nbsp;&nbsp;起初想的是 ajax，但是否定了，因为 ajax 请求是不能够返回文件流的，由于有很大的数据做参数进行传递，所以就使用的讨巧的方式——form 表单提交。<br></p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;原理就是生成一个临时的 form 表单，表单的提交是可以返回文件下载功能的。<br></p>
<p>&nbsp;&nbsp;&nbsp;&nbsp;如下贴代码:<br></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">&lt;button&amp;nbsp;type=&quot;button&quot;&amp;nbsp;class=&quot;btn&amp;nbsp;btn-primary&quot;&amp;nbsp;onclick=&quot;exportComprehensiveTable()&quot;&gt;导出&lt;/button&gt;</span><br></pre></td></tr></table></figure>
<p><br></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;//&amp;nbsp;导出表格信息</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;function&amp;nbsp;exportComprehensiveTable()&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;var&amp;nbsp;comprehensiveTableData&amp;nbsp;=&amp;nbsp;$(&amp;#39;#comprehensive_table&amp;#39;).bootstrapTable(&amp;#39;getData&amp;#39;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;if&amp;nbsp;(comprehensiveTableData.length&amp;nbsp;&gt;&amp;nbsp;0)&amp;nbsp;&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;$(&amp;#39;.exportComprehensiveTableBtn&amp;#39;).attr(&amp;#39;disabled&amp;#39;,&amp;#39;disabled&amp;#39;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;var&amp;nbsp;form=$(&quot;&lt;form&gt;&quot;);//定义一个form表单</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.attr(&quot;style&quot;,&quot;display:none&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.attr(&quot;target&quot;,&quot;&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.attr(&quot;method&quot;,&quot;post&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.attr(&quot;action&quot;,&quot;/customer/comprehensive/download&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;var&amp;nbsp;input1=$(&quot;&lt;input&gt;&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;input1.attr(&quot;type&quot;,&quot;hidden&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;input1.attr(&quot;name&quot;,&quot;exportData&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;input1.attr(&quot;value&quot;,(JSON.stringify(comprehensiveTableData)));</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;$(&quot;body&quot;).append(form);//将表单放置在web中</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.append(input1);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.submit();//表单提交</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;form.remove();</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;setTimeout(function&amp;nbsp;()&amp;nbsp;&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;$(&amp;#39;.exportComprehensiveTableBtn&amp;#39;).removeAttr(&amp;#39;disabled&amp;#39;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;hideOverLay();</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&#125;,&amp;nbsp;1000);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&#125;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">@PostMapping(&quot;/comprehensive/download&quot;)</span><br><span class="line">public&amp;nbsp;ResponseEntity&lt;InputStreamResource&gt;&amp;nbsp;downloadComprehensive(@RequestParam(name&amp;nbsp;=&amp;nbsp;&quot;exportData&quot;)&amp;nbsp;Object&amp;nbsp;data)&amp;nbsp;&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;String&amp;nbsp;fileName&amp;nbsp;=&amp;nbsp;&quot;综合统计.xlsx&quot;;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;InputStream&amp;nbsp;is&amp;nbsp;=&amp;nbsp;customerService.downloadComprehensive(JSON.parseObject(data.toString(),&amp;nbsp;List.class));</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;if&amp;nbsp;(is&amp;nbsp;==&amp;nbsp;null)&amp;nbsp;return&amp;nbsp;null;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;HttpHeaders&amp;nbsp;headers&amp;nbsp;=&amp;nbsp;new&amp;nbsp;HttpHeaders();</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;try&amp;nbsp;&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;headers.add(&quot;Content-Disposition&quot;,&amp;nbsp;&quot;attachment;filename=&quot;&amp;nbsp;+&amp;nbsp;URLEncoder.encode(fileName,&amp;nbsp;&quot;utf-8&quot;));</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&#125;&amp;nbsp;catch&amp;nbsp;(UnsupportedEncodingException&amp;nbsp;e)&amp;nbsp;&#123;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;e.printStackTrace();</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;return&amp;nbsp;null;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&#125;</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;headers.add(&quot;content-type&quot;,&amp;nbsp;&quot;application/octet-stream&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;headers.add(&quot;Cache-Control&quot;,&amp;nbsp;&quot;no-cache,&amp;nbsp;no-store,&amp;nbsp;must-revalidate&quot;);</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;return&amp;nbsp;ResponseEntity</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;.ok()</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;.headers(headers)</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;.contentType(MediaType.parseMediaType(&quot;application/octet-stream&quot;))</span><br><span class="line">&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;.body(new&amp;nbsp;InputStreamResource(is));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
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